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Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐Rule 13d-1(b)

☒Rule 13d-1(c)

☐Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), indicate type of person filing.

Not applicable.

Item 4.

Ownership.

(a)

Amount beneficially owned: See row 9 of the cover page.

(b)

Percent of class: See row 11 of the cover page.

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or direct the vote:

See row 5 of the cover page.

(ii)

Shared power to vote or direct the vote:

See row 6 of the cover page.

(iii)

Sole power to dispose or to direct the disposition of:

See row 7 of the cover page.

(iv)

Shared power to dispose or to direct the disposition of:

See row 8 of the cover page.

Percent of class is based on (i) the number of shares that may be deemed to be beneficially owned by Longview as of December 31, 2017 and (ii) the number of shares of common stock outstanding as of December 13, 2017 (140,970,447 shares) as reported by the Issuer in a prospectus supplement filed with the Securities and Exchange Commission on December 18, 2017.

Item 5.

Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following ý

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not applicable.

Item 8.

Identification and Classification of Members of the Group.

Not applicable.

Item 9.

Notice of Dissolution of Group.

Not applicable.

Item 10.

Certifications.

Not applicable.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.